Replace JNA with the FFM API (Panama) for the Opus binding

Bind libopus through java.lang.foreign downcall handles instead of JNA:
the ctl functions are linked with firstVariadicArg(2), and the encoder and
decoder each own a shared Arena holding the handle plus reusable native
PCM/packet buffers, so the hot path only allocates the returned packet.

The library is resolved by system SONAME first, falling back to a bundled
copy extracted from the JAR. Only the Windows x86-64 build is packaged by
default now (-Dnatives.all restores all platforms), since every other
platform ships libopus through its package manager.

Requires Java 26.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

ts3-client/README.md

@@ -10,8 +10,8 @@ TeaVM/CheerpJ) without touching the library:
 
 | Module | Artifact | Responsibility |
 |--------|----------|----------------|
-| `core` | `ts3-client-core` | Frontend-agnostic library: protocol integration, server model, connection orchestration, audio **abstractions**. No UI, no platform audio, no JNA. |
+| `core` | `ts3-client-core` | Frontend-agnostic library: protocol integration, server model, connection orchestration, audio **abstractions**. No UI, no platform audio, no native code. |
-| `desktop` | `ts3-client-desktop` | Desktop audio backend: Java Sound capture/playback + native Opus via JNA, implementing the core audio interfaces. |
+| `desktop` | `ts3-client-desktop` | Desktop audio backend: Java Sound capture/playback + native Opus via the FFM API (project Panama), implementing the core audio interfaces. |
 | `swing` | `ts3-client-swing` | Swing desktop UI + entry point. Depends on `core` and `desktop`. |
 
 The core exposes `AudioBackend` / `VoiceInput` / `VoiceOutput`; the frontend injects
@@ -21,8 +21,11 @@ frontend supplies its own UI and audio backend while reusing `core` unchanged.
 ## Features
 
 ### Voice (the priority)
-- **Native Opus codec** via a direct JNA binding to the system `libopus`
+- **Native Opus codec** via a direct Panama (Foreign Function & Memory API) binding —
-  (no bundled/native-jar dependency). Encoding at 48 kHz, 20 ms frames.
+  no JNA, no other third-party FFI. The system `libopus` is used when installed,
+  otherwise a bundled copy is extracted from the JAR. Only the Windows x86-64 build
+  is bundled by default (build with `-Dnatives.all` to package every platform);
+  elsewhere install libopus from your package manager. Encoding at 48 kHz, 20 ms frames.
 - **Voice Activation Detection (VAD)** with the same three modes as the TS3 client:
   - **Volume Gate** — RMS/dBFS threshold with a live input meter and hangover.
   - **Automatic** — a dependency-free speech detector (short-term energy + spectral
@@ -78,7 +81,7 @@ frontend supplies its own UI and audio backend while reusing `core` unchanged.
 - Change your nickname, mute/deafen from the toolbar.
 
 ## Requirements
-- Java 17+ (developed/tested on Temurin 26)
+- Java 26+ (developed/tested on Temurin 26)
 - The native Opus library on the system:
   - Debian/Ubuntu: `sudo apt install libopus0`
   - Arch: `sudo pacman -S opus`
@@ -124,7 +127,7 @@ core/   com.ts3client
     └── ConnectionListener   frontend callbacks
 
 desktop/  com.ts3client.audio.desktop
-├── Opus                     JNA binding to native libopus
+├── Opus                     Panama (FFM) binding to native libopus
 ├── OpusEncoder/OpusDecoder  thin codec wrappers
 ├── AudioDevices             device enumeration + line opening (48 kHz/16-bit)
 ├── JavaSoundVoiceInput      capture + VAD/PTT gating + Opus encode

ts3-client/desktop/pom.xml

@@ -12,7 +12,7 @@
 
     <artifactId>ts3-client-desktop</artifactId>
     <name>TS3J Client Desktop Audio</name>
-    <description>Desktop audio backend: Java Sound capture/playback and native Opus via JNA</description>
+    <description>Desktop audio backend: Java Sound capture/playback and native Opus via the FFM API</description>
 
     <dependencies>
         <dependency>
@@ -23,9 +23,43 @@
             <groupId>com.github.manevolent</groupId>
             <artifactId>ts3j</artifactId>
         </dependency>
-        <dependency>
-            <groupId>net.java.dev.jna</groupId>
-            <artifactId>jna</artifactId>
-        </dependency>
     </dependencies>
+
+    <build>
+        <!--
+            Only the Windows x86-64 Opus build is packaged by default: every other
+            supported platform ships libopus through its package manager (or, on
+            macOS, Homebrew), and the FFM binding loads the system library first.
+            Build with -Dnatives.all to bundle the copies for all platforms.
+        -->
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <excludes>
+                    <exclude>darwin/**</exclude>
+                    <exclude>darwin-*/**</exclude>
+                    <exclude>linux-*/**</exclude>
+                    <exclude>win32-x86/**</exclude>
+                </excludes>
+            </resource>
+        </resources>
+    </build>
+
+    <profiles>
+        <profile>
+            <id>all-natives</id>
+            <activation>
+                <property>
+                    <name>natives.all</name>
+                </property>
+            </activation>
+            <build>
+                <resources>
+                    <resource>
+                        <directory>src/main/resources</directory>
+                    </resource>
+                </resources>
+            </build>
+        </profile>
+    </profiles>
 </project>

ts3-client/desktop/src/main/java/com/ts3client/audio/desktop/JavaSoundAudioBackend.java

@@ -24,7 +24,7 @@ public final class JavaSoundAudioBackend implements AudioBackend {
     @Override
     public String description() {
         try {
-            return "Opus " + Opus.INSTANCE.opus_get_version_string();
+            return "Opus " + Opus.getVersionString();
         } catch (Throwable t) {
             return "Opus (native library unavailable)";
         }

ts3-client/desktop/src/main/java/com/ts3client/audio/desktop/Opus.java

@@ -1,64 +1,283 @@
 package com.ts3client.audio.desktop;
 
-import com.sun.jna.Library;
+import java.io.IOException;
-import com.sun.jna.Native;
+import java.io.InputStream;
-import com.sun.jna.ptr.PointerByReference;
+import java.lang.foreign.Arena;
-
+import java.lang.foreign.FunctionDescriptor;
-import java.nio.IntBuffer;
+import java.lang.foreign.Linker;
+import java.lang.foreign.MemorySegment;
+import java.lang.foreign.SymbolLookup;
+import java.lang.foreign.ValueLayout;
+import java.lang.invoke.MethodHandle;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+import java.util.List;
 
 /**
- * Minimal JNA binding to the native Opus codec library (libopus).
+ * Binding to the native Opus codec library (libopus) via the Foreign Function &
+ * Memory API (project Panama).
  *
- * <p>{@link Native#load} first tries a system-installed {@code libopus.so}/
+ * <p>The library is resolved by first trying the system-installed {@code libopus}
- * {@code opus.dll}; failing that, JNA extracts and loads the copy we bundle on
+ * under its usual SONAMEs; failing that, the copy we bundle on the classpath for
- * the classpath under its platform resource path (e.g. {@code linux-x86-64/libopus.so},
+ * the running platform (e.g. {@code linux-x86-64/libopus.so}, {@code win32-x86-64/opus.dll})
- * {@code win32-x86-64/opus.dll}), so the client runs from the single JAR with no
+ * is extracted to a temporary file and loaded, so the client runs from the single
- * external Opus install. Opus always operates internally at 48&nbsp;kHz which
+ * JAR with no external Opus install. Opus always operates internally at 48&nbsp;kHz
- * matches what the TeamSpeak 3 protocol uses on the wire.
+ * which matches what the TeamSpeak 3 protocol uses on the wire.
  */
-public interface Opus extends Library {
+public final class Opus {
 
-    Opus INSTANCE = Native.load("opus", Opus.class);
+    private Opus() {
+    }
 
     // ---- application types (opus_defines.h) ----
-    int OPUS_APPLICATION_VOIP = 2048;
+    public static final int OPUS_APPLICATION_VOIP = 2048;
-    int OPUS_APPLICATION_AUDIO = 2049;
+    public static final int OPUS_APPLICATION_AUDIO = 2049;
-    int OPUS_APPLICATION_RESTRICTED_LOWDELAY = 2051;
+    public static final int OPUS_APPLICATION_RESTRICTED_LOWDELAY = 2051;
 
     // ---- CTL request codes ----
-    int OPUS_SET_BITRATE_REQUEST = 4002;
+    public static final int OPUS_SET_BITRATE_REQUEST = 4002;
-    int OPUS_SET_VBR_REQUEST = 4006;
+    public static final int OPUS_SET_VBR_REQUEST = 4006;
-    int OPUS_SET_COMPLEXITY_REQUEST = 4010;
+    public static final int OPUS_SET_COMPLEXITY_REQUEST = 4010;
-    int OPUS_SET_INBAND_FEC_REQUEST = 4012;
+    public static final int OPUS_SET_INBAND_FEC_REQUEST = 4012;
-    int OPUS_SET_PACKET_LOSS_PERC_REQUEST = 4014;
+    public static final int OPUS_SET_PACKET_LOSS_PERC_REQUEST = 4014;
-    int OPUS_SET_SIGNAL_REQUEST = 4024;
+    public static final int OPUS_SET_SIGNAL_REQUEST = 4024;
-    int OPUS_RESET_STATE = 4028;
+    public static final int OPUS_RESET_STATE = 4028;
 
     // ---- signal hints ----
-    int OPUS_AUTO = -1000;
+    public static final int OPUS_AUTO = -1000;
-    int OPUS_SIGNAL_VOICE = 3001;
+    public static final int OPUS_SIGNAL_VOICE = 3001;
-    int OPUS_SIGNAL_MUSIC = 3002;
+    public static final int OPUS_SIGNAL_MUSIC = 3002;
 
-    // ---- encoder ----
+    private static final ValueLayout.OfInt INT = ValueLayout.JAVA_INT;
-    PointerByReference opus_encoder_create(int fs, int channels, int application, IntBuffer error);
+    private static final java.lang.foreign.AddressLayout PTR = ValueLayout.ADDRESS;
 
-    int opus_encode_float(PointerByReference st, float[] pcm, int frameSize, byte[] data, int maxDataBytes);
+    private static final Linker LINKER = Linker.nativeLinker();
+    private static final SymbolLookup LOOKUP = NativeLibraries.loadOpus();
 
-    int opus_encoder_ctl(PointerByReference st, int request, Object... args);
+    // OpusEncoder *opus_encoder_create(opus_int32 fs, int channels, int application, int *error)
+    private static final MethodHandle ENCODER_CREATE =
+            downcall("opus_encoder_create", FunctionDescriptor.of(PTR, INT, INT, INT, PTR));
+    // opus_int32 opus_encode_float(OpusEncoder *st, const float *pcm, int frame_size,
+    //                              unsigned char *data, opus_int32 max_data_bytes)
+    private static final MethodHandle ENCODE_FLOAT =
+            downcall("opus_encode_float", FunctionDescriptor.of(INT, PTR, PTR, INT, PTR, INT));
+    private static final MethodHandle ENCODER_DESTROY =
+            downcall("opus_encoder_destroy", FunctionDescriptor.ofVoid(PTR));
 
-    void opus_encoder_destroy(PointerByReference st);
+    // OpusDecoder *opus_decoder_create(opus_int32 fs, int channels, int *error)
+    private static final MethodHandle DECODER_CREATE =
+            downcall("opus_decoder_create", FunctionDescriptor.of(PTR, INT, INT, PTR));
+    // int opus_decode_float(OpusDecoder *st, const unsigned char *data, opus_int32 len,
+    //                       float *pcm, int frame_size, int decode_fec)
+    private static final MethodHandle DECODE_FLOAT =
+            downcall("opus_decode_float", FunctionDescriptor.of(INT, PTR, PTR, INT, PTR, INT, INT));
+    private static final MethodHandle DECODER_DESTROY =
+            downcall("opus_decoder_destroy", FunctionDescriptor.ofVoid(PTR));
 
-    // ---- decoder ----
+    private static final MethodHandle STRERROR =
-    PointerByReference opus_decoder_create(int fs, int channels, IntBuffer error);
+            downcall("opus_strerror", FunctionDescriptor.of(PTR, INT));
+    private static final MethodHandle GET_VERSION_STRING =
+            downcall("opus_get_version_string", FunctionDescriptor.of(PTR));
 
-    int opus_decode_float(PointerByReference st, byte[] data, int len, float[] pcm, int frameSize, int decodeFec);
+    // int opus_encoder_ctl(OpusEncoder *st, int request, ...) — the value argument is
+    // variadic, so the linker must be told where the variadic part starts (index 2).
+    private static final MethodHandle ENCODER_CTL_SET = variadicCtl("opus_encoder_ctl");
+    private static final MethodHandle DECODER_CTL_SET = variadicCtl("opus_decoder_ctl");
 
-    int opus_decoder_ctl(PointerByReference st, int request, Object... args);
+    private static MethodHandle downcall(String symbol, FunctionDescriptor descriptor) {
+        return LINKER.downcallHandle(find(symbol), descriptor);
+    }
 
-    void opus_decoder_destroy(PointerByReference st);
+    private static MethodHandle variadicCtl(String symbol) {
+        return LINKER.downcallHandle(
+                find(symbol),
+                FunctionDescriptor.of(INT, PTR, INT, INT),
+                Linker.Option.firstVariadicArg(2));
+    }
 
-    // ---- misc ----
+    private static MemorySegment find(String symbol) {
-    String opus_get_version_string();
+        return LOOKUP.find(symbol)
+                .orElseThrow(() -> new UnsatisfiedLinkError("libopus: unresolved symbol " + symbol));
+    }
 
-    String opus_strerror(int error);
+    static MemorySegment encoderCreate(int sampleRate, int channels, int application, MemorySegment error) {
+        try {
+            return (MemorySegment) ENCODER_CREATE.invokeExact(sampleRate, channels, application, error);
+        } catch (Throwable t) {
+            throw wrap(t);
+        }
+    }
+
+    static int encodeFloat(MemorySegment st, MemorySegment pcm, int frameSize,
+                           MemorySegment data, int maxDataBytes) {
+        try {
+            return (int) ENCODE_FLOAT.invokeExact(st, pcm, frameSize, data, maxDataBytes);
+        } catch (Throwable t) {
+            throw wrap(t);
+        }
+    }
+
+    static void encoderDestroy(MemorySegment st) {
+        try {
+            ENCODER_DESTROY.invokeExact(st);
+        } catch (Throwable t) {
+            throw wrap(t);
+        }
+    }
+
+    static int encoderCtl(MemorySegment st, int request, int value) {
+        try {
+            return (int) ENCODER_CTL_SET.invokeExact(st, request, value);
+        } catch (Throwable t) {
+            throw wrap(t);
+        }
+    }
+
+    static MemorySegment decoderCreate(int sampleRate, int channels, MemorySegment error) {
+        try {
+            return (MemorySegment) DECODER_CREATE.invokeExact(sampleRate, channels, error);
+        } catch (Throwable t) {
+            throw wrap(t);
+        }
+    }
+
+    static int decodeFloat(MemorySegment st, MemorySegment data, int len,
+                           MemorySegment pcm, int frameSize, int decodeFec) {
+        try {
+            return (int) DECODE_FLOAT.invokeExact(st, data, len, pcm, frameSize, decodeFec);
+        } catch (Throwable t) {
+            throw wrap(t);
+        }
+    }
+
+    static void decoderDestroy(MemorySegment st) {
+        try {
+            DECODER_DESTROY.invokeExact(st);
+        } catch (Throwable t) {
+            throw wrap(t);
+        }
+    }
+
+    static int decoderCtl(MemorySegment st, int request, int value) {
+        try {
+            return (int) DECODER_CTL_SET.invokeExact(st, request, value);
+        } catch (Throwable t) {
+            throw wrap(t);
+        }
+    }
+
+    /** Human-readable message for an Opus error code. */
+    public static String strerror(int error) {
+        try {
+            MemorySegment message = (MemorySegment) STRERROR.invokeExact(error);
+            return cString(message);
+        } catch (Throwable t) {
+            throw wrap(t);
+        }
+    }
+
+    /** Version string of the loaded libopus, e.g. {@code libopus 1.4}. */
+    public static String getVersionString() {
+        try {
+            MemorySegment version = (MemorySegment) GET_VERSION_STRING.invokeExact();
+            return cString(version);
+        } catch (Throwable t) {
+            throw wrap(t);
+        }
+    }
+
+    /** Reads a NUL-terminated C string from a zero-length (unbounded) return segment. */
+    private static String cString(MemorySegment segment) {
+        if (segment.address() == 0) {
+            return null;
+        }
+        return segment.reinterpret(Long.MAX_VALUE).getString(0);
+    }
+
+    private static RuntimeException wrap(Throwable t) {
+        if (t instanceof RuntimeException re) {
+            return re;
+        }
+        if (t instanceof Error e) {
+            throw e;
+        }
+        return new IllegalStateException("libopus call failed", t);
+    }
+
+    /**
+     * Resolves libopus: system install first, bundled classpath copy second.
+     */
+    private static final class NativeLibraries {
+
+        static SymbolLookup loadOpus() {
+            Arena arena = Arena.global();
+            for (String name : candidateNames()) {
+                try {
+                    return SymbolLookup.libraryLookup(name, arena);
+                } catch (IllegalArgumentException ignored) {
+                    // not present under this name; try the next one
+                }
+            }
+            return SymbolLookup.libraryLookup(extractBundled(), arena);
+        }
+
+        /** SONAMEs/filenames a system-installed libopus may carry, in preference order. */
+        private static List<String> candidateNames() {
+            String os = System.getProperty("os.name", "").toLowerCase();
+            if (os.contains("win")) {
+                return List.of("opus.dll", "libopus-0.dll", "libopus.dll");
+            }
+            if (os.contains("mac") || os.contains("darwin")) {
+                return List.of("libopus.dylib", "libopus.0.dylib");
+            }
+            return List.of("libopus.so.0", "libopus.so");
+        }
+
+        private static Path extractBundled() {
+            String libraryName = System.mapLibraryName("opus");
+            for (String directory : platformDirectories()) {
+                String resource = directory + "/" + libraryName;
+                try (InputStream in = Opus.class.getClassLoader().getResourceAsStream(resource)) {
+                    if (in == null) {
+                        continue;
+                    }
+                    Path dir = Files.createTempDirectory("ts3-client-opus");
+                    dir.toFile().deleteOnExit();
+                    Path file = dir.resolve(libraryName);
+                    Files.copy(in, file, StandardCopyOption.REPLACE_EXISTING);
+                    file.toFile().deleteOnExit();
+                    return file;
+                } catch (IOException e) {
+                    throw new UnsatisfiedLinkError("failed to extract bundled libopus: " + e);
+                }
+            }
+            throw new UnsatisfiedLinkError("libopus not found on this system and no bundled copy for "
+                    + platformDirectories());
+        }
+
+        /**
+         * Classpath directories that may hold the bundled native (JNA's platform layout),
+         * most specific first — macOS also ships an architecture-agnostic {@code darwin/}.
+         */
+        private static List<String> platformDirectories() {
+            String os = System.getProperty("os.name", "").toLowerCase();
+            String arch = System.getProperty("os.arch", "").toLowerCase();
+
+            String normalizedArch = switch (arch) {
+                case "amd64", "x86_64" -> "x86-64";
+                case "i386", "i486", "i586", "i686", "x86" -> "x86";
+                case "aarch64", "arm64" -> "aarch64";
+                default -> arch.startsWith("arm") ? "arm" : arch;
+            };
+
+            if (os.contains("win")) {
+                return List.of("win32-" + normalizedArch);
+            }
+            if (os.contains("mac") || os.contains("darwin")) {
+                return List.of("darwin-" + normalizedArch, "darwin");
+            }
+            return List.of("linux-" + normalizedArch);
+        }
+    }
 }

ts3-client/desktop/src/main/java/com/ts3client/audio/desktop/OpusDecoder.java

@@ -1,8 +1,8 @@
 package com.ts3client.audio.desktop;
 
-import com.sun.jna.ptr.PointerByReference;
+import java.lang.foreign.Arena;
-
+import java.lang.foreign.MemorySegment;
-import java.nio.IntBuffer;
+import java.lang.foreign.ValueLayout;
 
 /**
  * Thin wrapper around a native Opus decoder.
@@ -13,7 +13,12 @@ import java.nio.IntBuffer;
  */
 public final class OpusDecoder implements AutoCloseable {
 
-    private final PointerByReference handle;
+    private static final int MAX_PACKET_BYTES = 4096;
+
+    private final Arena arena = Arena.ofShared();
+    private final MemorySegment handle;
+    private final MemorySegment packetBuffer;
+    private final MemorySegment pcmBuffer;
     private final int frameSize;
     private final int channels;
     private boolean closed;
@@ -22,12 +27,17 @@ public final class OpusDecoder implements AutoCloseable {
         this.frameSize = frameSize;
         this.channels = channels;
 
-        IntBuffer error = IntBuffer.allocate(1);
+        MemorySegment error = arena.allocate(ValueLayout.JAVA_INT);
-        handle = Opus.INSTANCE.opus_decoder_create(sampleRate, channels, error);
+        MemorySegment created = Opus.decoderCreate(sampleRate, channels, error);
-        if (handle == null || error.get(0) != 0) {
+        int errorCode = error.get(ValueLayout.JAVA_INT, 0);
-            throw new IllegalStateException("opus_decoder_create failed: "
+        if (created.address() == 0 || errorCode != 0) {
-                    + Opus.INSTANCE.opus_strerror(error.get(0)));
+            arena.close();
+            throw new IllegalStateException("opus_decoder_create failed: " + Opus.strerror(errorCode));
         }
+
+        this.handle = created;
+        this.packetBuffer = arena.allocate(MAX_PACKET_BYTES);
+        this.pcmBuffer = arena.allocate(ValueLayout.JAVA_FLOAT, (long) frameSize * channels);
     }
 
     /**
@@ -40,23 +50,29 @@ public final class OpusDecoder implements AutoCloseable {
      */
     public int decode(byte[] packet, float[] out) {
         if (closed) throw new IllegalStateException("decoder closed");
-        int samples = Opus.INSTANCE.opus_decode_float(
+
-                handle,
+        MemorySegment data = MemorySegment.NULL;
-                packet,
+        int len = 0;
-                packet == null ? 0 : packet.length,
+        if (packet != null) {
-                out,
+            if (packet.length > MAX_PACKET_BYTES) {
-                frameSize,
+                throw new IllegalArgumentException("packet too large: " + packet.length);
-                0);
+            }
-        if (samples < 0) {
+            MemorySegment.copy(packet, 0, packetBuffer, ValueLayout.JAVA_BYTE, 0, packet.length);
-            throw new IllegalStateException("opus_decode_float failed: "
+            data = packetBuffer;
-                    + Opus.INSTANCE.opus_strerror(samples));
+            len = packet.length;
         }
+
+        int samples = Opus.decodeFloat(handle, data, len, pcmBuffer, frameSize, 0);
+        if (samples < 0) {
+            throw new IllegalStateException("opus_decode_float failed: " + Opus.strerror(samples));
+        }
+        MemorySegment.copy(pcmBuffer, ValueLayout.JAVA_FLOAT, 0, out, 0, samples * channels);
         return samples;
     }
 
     public void reset() {
         if (closed) return;
-        Opus.INSTANCE.opus_decoder_ctl(handle, Opus.OPUS_RESET_STATE);
+        Opus.decoderCtl(handle, Opus.OPUS_RESET_STATE, 0);
     }
 
     public int getChannels() {
@@ -67,6 +83,7 @@ public final class OpusDecoder implements AutoCloseable {
     public void close() {
         if (closed) return;
         closed = true;
-        Opus.INSTANCE.opus_decoder_destroy(handle);
+        Opus.decoderDestroy(handle);
+        arena.close();
     }
 }

ts3-client/desktop/src/main/java/com/ts3client/audio/desktop/OpusEncoder.java

@@ -1,21 +1,29 @@
 package com.ts3client.audio.desktop;
 
-import com.sun.jna.ptr.PointerByReference;
+import java.lang.foreign.Arena;
-
+import java.lang.foreign.MemorySegment;
-import java.nio.IntBuffer;
+import java.lang.foreign.ValueLayout;
 
 /**
  * Thin wrapper around a native Opus encoder configured for TeamSpeak voice.
  *
  * <p>Fixed at 48&nbsp;kHz. Frames are 20&nbsp;ms (960 samples per channel), which
  * is the frame size the TS3 client uses.
+ *
+ * <p>The native scratch buffers live in a shared arena owned by this instance and
+ * are freed by {@link #close()}; access is serialised by the instance lock, so the
+ * encoder may be driven from any thread.
  */
 public final class OpusEncoder implements AutoCloseable {
 
-    private final PointerByReference handle;
+    private static final int MAX_PACKET_BYTES = 4096;
+
+    private final Arena arena = Arena.ofShared();
+    private final MemorySegment handle;
+    private final MemorySegment pcmBuffer;
+    private final MemorySegment packetBuffer;
     private final int frameSize;
     private final int channels;
-    private final byte[] out = new byte[4096];
     private final Object lock = new Object();
     private boolean closed;
 
@@ -23,12 +31,17 @@ public final class OpusEncoder implements AutoCloseable {
         this.frameSize = frameSize;
         this.channels = channels;
 
-        IntBuffer error = IntBuffer.allocate(1);
+        MemorySegment error = arena.allocate(ValueLayout.JAVA_INT);
-        handle = Opus.INSTANCE.opus_encoder_create(sampleRate, channels, application, error);
+        MemorySegment created = Opus.encoderCreate(sampleRate, channels, application, error);
-        if (handle == null || error.get(0) != 0) {
+        int errorCode = error.get(ValueLayout.JAVA_INT, 0);
-            throw new IllegalStateException("opus_encoder_create failed: "
+        if (created.address() == 0 || errorCode != 0) {
-                    + Opus.INSTANCE.opus_strerror(error.get(0)));
+            arena.close();
+            throw new IllegalStateException("opus_encoder_create failed: " + Opus.strerror(errorCode));
         }
+
+        this.handle = created;
+        this.pcmBuffer = arena.allocate(ValueLayout.JAVA_FLOAT, (long) frameSize * channels);
+        this.packetBuffer = arena.allocate(MAX_PACKET_BYTES);
     }
 
     public void setBitrate(int bitsPerSecond) {
@@ -58,10 +71,10 @@ public final class OpusEncoder implements AutoCloseable {
     private void ctl(int request, int value) {
         synchronized (lock) {
             if (closed) return;
-            int r = Opus.INSTANCE.opus_encoder_ctl(handle, request, value);
+            int r = Opus.encoderCtl(handle, request, value);
             if (r < 0) {
                 throw new IllegalStateException("opus_encoder_ctl(" + request + ") failed: "
-                        + Opus.INSTANCE.opus_strerror(r));
+                        + Opus.strerror(r));
             }
         }
     }
@@ -73,19 +86,19 @@ public final class OpusEncoder implements AutoCloseable {
      * @return a newly allocated byte array holding the encoded packet
      */
     public byte[] encode(float[] pcm) {
-        if (pcm.length != frameSize * channels) {
+        int expected = frameSize * channels;
-            throw new IllegalArgumentException("expected " + (frameSize * channels)
+        if (pcm.length != expected) {
-                    + " samples, got " + pcm.length);
+            throw new IllegalArgumentException("expected " + expected + " samples, got " + pcm.length);
         }
         synchronized (lock) {
             if (closed) throw new IllegalStateException("encoder closed");
-            int len = Opus.INSTANCE.opus_encode_float(handle, pcm, frameSize, out, out.length);
+            MemorySegment.copy(pcm, 0, pcmBuffer, ValueLayout.JAVA_FLOAT, 0, expected);
+            int len = Opus.encodeFloat(handle, pcmBuffer, frameSize, packetBuffer, MAX_PACKET_BYTES);
             if (len < 0) {
-                throw new IllegalStateException("opus_encode_float failed: "
+                throw new IllegalStateException("opus_encode_float failed: " + Opus.strerror(len));
-                        + Opus.INSTANCE.opus_strerror(len));
             }
             byte[] packet = new byte[len];
-            System.arraycopy(out, 0, packet, 0, len);
+            MemorySegment.copy(packetBuffer, ValueLayout.JAVA_BYTE, 0, packet, 0, len);
             return packet;
         }
     }
@@ -95,7 +108,8 @@ public final class OpusEncoder implements AutoCloseable {
         synchronized (lock) {
             if (closed) return;
             closed = true;
-            Opus.INSTANCE.opus_encoder_destroy(handle);
+            Opus.encoderDestroy(handle);
+            arena.close();
         }
     }
 }

ts3-client/pom.xml

@@ -19,10 +19,9 @@
     </modules>
 
     <properties>
-        <maven.compiler.release>17</maven.compiler.release>
+        <maven.compiler.release>26</maven.compiler.release>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <ts3j.version>1.0.3</ts3j.version>
-        <jna.version>5.14.0</jna.version>
     </properties>
 
     <dependencyManagement>
@@ -32,11 +31,6 @@
                 <artifactId>ts3j</artifactId>
                 <version>${ts3j.version}</version>
             </dependency>
-            <dependency>
-                <groupId>net.java.dev.jna</groupId>
-                <artifactId>jna</artifactId>
-                <version>${jna.version}</version>
-            </dependency>
             <dependency>
                 <groupId>com.ts3client</groupId>
                 <artifactId>ts3-client-core</artifactId>